PRIMARY SYNOVIAL CHONDROMATOSIS OF ANKLE JOINT: A CASE REPORT

Abstract

Primary synovial osteochondromatosis is an uncommon usually benign disorder characterized by the presence of metaplastic cartilage nodules originating from the synovia, bursa and tendon sheaths. It presents unilaterally in large joints such as the knee but can occur in the shoulder and elbow. Involvement of ankle is rare. Although may be asymptomatic, common complains include pain, swelling and decreased range of motion. In the early stage, diagnosis can only be confirmed by MRI. When unmineralised synovium detaches and calcifies it is easily picked up by conventional radiography. Treatment is mainly surgical but depends on symptoms and stage of disease. Long term complications include malignant transformation and progressive secondary osteoarthritis. We report here a rare case of primary synovial carcinomatosis involving ankle joint. It is important to be aware of this condition to prevent incorrect diagnosis and unjustified surgery.

Key words: Synovial chondromatosis, Primary, Ankle, Loose bodies